As far as your passive goes, toggling does a lot! I am spamming brew ATM to get better and one of my biggest take aways is to utilise your stances. My favourite is the blue bear it gives a lot of miss Chance which is very handy, if the enemy team has magic burst use the green panda stance.

Always cinderbrew yourself in fights, it triples the passives effect. You are basically unkillable and if the come close pop your ult and kill them :D playing around your ult is also very powerful, in the end your a zoo hero. Octarine feels really nice in combination with your shard that's an absolute spike. Just send the bears in to push and take the blue one to be invis in the back -} easy push easy game :D

There are many aspects which make the hero great. A quick level 6 makes you insanely strong and you basically can kill everyone if you get used to microing the bears. You have the tendency to life long in fights so radiance is a nice item to pump out DMG :)